AP PSYCHOLOGY

Detailed explanation-1: -In 1913, the American psychologist John B. Watson, argued that mental processes could not be reliably located or measured, and that only observable, measurable behavior should be the focus of psychology.

Detailed explanation-2: -Behaviorism became popular due to psychologist B. F. Skinner. Skinner studied how behavior is shaped by rewards and punishments.

Detailed explanation-3: -Developmental psychologists study changes in human development across the lifespan, including physical, cognitive, social, intellectual, perceptual, personality and emotional growth.

Detailed explanation-4: -Behaviorism focuses on the idea that all behaviors are learned through interaction with the environment. This learning theory states that behaviors are learned from the environment, and says that innate or inherited factors have very little influence on behavior.